This documents may help answer your questions about buffer sizes and how they are shared amongst ports on the two switches:

http://www.cisco.com/en/US/docs/solutions/Enterprise/Video/tpqoscampus.html

Look down at the QoS and queueing information (ignore the bits about TelePresence)

Reuben


On 17/02/2013 11:14 AM, CiscoNSP_list CiscoNSP_list wrote:


Hi Rob (Sorry for not replying inline, but hotmail screws the
formatting)

We did try tuning qos buffers (It did improve the drops, but they
were still significant), and we also tried disabling mls qos (Still
saw significant drops)....Im really interested to know why there is
such a difference between the two platforms....i.e. is it buffers/how
they are allocated, architectural differences or combination of
both?

Cheers.

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